Abstract
934 This study compared changes in performance, body composition, and hormonal responses after 12 wks of supervised (SUP) or unsupervised (UNSUP), periodized heavy resistance training. Twenty-two, moderately trained men (24±4 yrs) were tested for maximal (1RM) squat and bench press (BP) strength, lower body power output, BP local muscular endurance, body composition, and resting serum [testosterone] and [cortisol] at wk 0, and after 1 and 12 wks of training. Test-retest reliability coefficients were ≥ 0.95. Subjects were randomly assigned (2:1 experimental vs. control) to either SUP (n=14) in which training was supervised by a personal trainer or UNSUP (n=8) in which subjects trained without professional supervision. Groups performed identical linear periodized resistance training programs consisting of preparatory (10-12RM), hypertrophy (8-10RM), strength (5-8RM), and peaking phases (3-6RM) using free-weight and variable-resistance machine exercises. Squat and BP 1RM, mean and peak power output, absolute local muscular endurance, and fat mass increased significantly (p≤0.05) while [cortisol] decreased significantly in both groups following training. FFM,% body fat, and testosterone to cortisol ratio (T/C) increased significantly in SUP following training. Change(Wk 0 to Wk 12) in squat and BP 1RM, absolute local muscular endurance, and FFM were significantly greater in SUP than UNSUP. During training, mean resistance (kg/set) was significantly greater in SUP than UNSUP at wks 8 and 10 for the squat, and wks 7 to 12 for BP. Results indicate that maximal strength, absolute local muscular endurance, FFM, and T/C increase significantly greater following 12 wks of periodized heavy resistance training supervised by a personal trainer than in unsupervised training.
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